Council of Chalcedon

"God wants us to love him eternally with our whole hearts – not in such a way as to injure or weaken our earthly love, but to provide a kind of cantus firmus to which the other melodies of life provide the counterpoint. ... Where the cantus firmus is clear and plain, the counterpoint can be developed to its limits. The two are ‘undivided and yet distinct’, in the words of the Chalcedonian Definition, like Christ in his divine and human natures."